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4- The figure represents a simplified program for operating a press. The palm buttons are normally open switches that activate a punch press (M1) when the operator depresses and keeps them depressed. A-1 represents a normally open limit switch for a guard. When the guard is closed, A1-1 is closed. Based on the program... a-the press will run if the palm buttons are depressed regardless of the guard position. b-the press will run even if only one of the palm buttons is depressed c-The press will not run if the guard is open d-the press will only run if both palm buttons are depresses and the guard is open